Well the store manager was very helpfull, he understood the problem and that the salesman sold me lighting that wouldn't be right for my tank. He took back the light gave me double points on my card and gave me a good discount on the 48" Aqualight Pro 250W HQI -- so thats what I got
( I had the option to get the discount on the 150w version but I figured the 250w would be better in the long run)